A hex nut is a type of fastener with a hexagonal shape, designed to fit onto a bolt or screw. It typically has internal threads that allow it to be securely tightened onto the threaded end of a bolt, providing a strong connection in various applications. Hex nuts are commonly made from materials like steel, stainless steel, or plastic, depending on the required strength and resistance to corrosion. These nuts are widely used in construction, automotive, and machinery industries, among others. They are often paired with a washer to distribute the load and prevent damage to the surface being fastened. The standard size and shape of hex nuts make them easy to use with standard tools like wrenches and sockets.